Hi Maid,
I only have one quibble.
A nuclear strike within the environs of Washington, D.C. would have resulted in more destruction than you depicted. I would suggest that you check online for photos taken of the destruction of Hiroshima and Nagasaki. Those bombs were in the KIloton to small Megaton range. Current weapons are orders of magnitude stronger.
Virtually every building in DDC would have been flattened by a nuclear blast. Even if it were an air burst. Depending on the size of the bomb, any and all hard construction materials and soil touched by the fireball would be vaproized and converted into radioactive particles to be spread by the wind.
As an Army Officer trained in the disciplines of nuclear attacks I can speak with some authority.
If you wish more detail, send me a PM.
